#include<stdio.h>

int main3()
{
	char a[80], b[80];
	int i = 0, j = 0;
	printf("the first string:\n");
	scanf("%s", a);
	printf("the second string:\n");
	scanf("%s", b);
	while(a[i] != '\0')
		i++;
	while(b[j] != '\0')
	{
		a[i] = b[j];
		j++;
		i++;
	}
	a[i] = '\0';
	printf("the string cat is: %s\n", a);
	return 0;

}
